Runtime fixes (#2017)

changes:

Added more QDELETED checks to organ processing.
Fixed some misc runtimes in lighting & sparks.

code/modules/effects/sparks/spawner.dm

@@ -40,7 +40,7 @@
 			playsound(location, "sparks", 100, 1)
 			var/direction = 0
 
-			if (!src.spread.len)
+			if (src.spread && src.spread.len)
 				direction = 0
 			else
 				direction = pick(src.spread)

code/modules/lighting/lighting_source.dm

@@ -262,7 +262,7 @@
 
 	var/do_offset = TRUE
 	var/turf/front = get_step(T, top_atom.dir)
-	if (front.has_opaque_atom)
+	if (front && front.has_opaque_atom)
 		do_offset = FALSE
 
 	cached_origin_x = T.x

code/modules/mob/living/carbon/human/human_organs.dm

@@ -25,6 +25,11 @@
 
 	//processing internal organs is pretty cheap, do that first.
 	for(var/obj/item/organ/I in internal_organs)
+		if (QDELETED(I))
+			log_debug("Organ [DEBUG_REF(src)] was not properly removed from its parent!")
+			internal_organs -= I
+			continue
+			
 		I.process()
 
 	handle_stance()

code/modules/organs/organ.dm

@@ -33,18 +33,16 @@ var/list/organ_cache = list()
 		return ..()
 
 	if(istype(owner, /mob/living/carbon))
-		if((owner.internal_organs) && (src in owner.internal_organs))
+		if(owner.internal_organs)
 			owner.internal_organs -= src
 		if(istype(owner, /mob/living/carbon/human))
-			if((owner.internal_organs_by_name) && (src in owner.internal_organs_by_name))
+			if(owner.internal_organs_by_name)
 				owner.internal_organs_by_name -= src
-			if((owner.organs) && (src in owner.organs))
+			if(owner.organs)
 				owner.organs -= src
-			if((owner.organs_by_name) && (src in owner.organs_by_name))
+			if(owner.organs_by_name)
 				owner.organs_by_name -= src
-	if(src in owner.contents)
-		owner.contents -= src
-
+				
 	owner = null 
 	QDEL_NULL(dna)